1 |
dpavlin |
48 |
package dhcpd; |
2 |
dpavlin |
1 |
|
3 |
dpavlin |
44 |
=head1 dhcpd |
4 |
dpavlin |
1 |
|
5 |
dpavlin |
44 |
start with: |
6 |
|
|
|
7 |
|
|
perl -Ilib/PXElator -Ilib -Mdhcpd -e start |
8 |
|
|
|
9 |
|
|
based on L<http://www.perlmonks.org/index.pl?node_id=325248> |
10 |
|
|
|
11 |
|
|
=cut |
12 |
|
|
|
13 |
dpavlin |
1 |
use strict; |
14 |
|
|
use warnings; |
15 |
|
|
|
16 |
dpavlin |
22 |
use autodie; |
17 |
|
|
|
18 |
dpavlin |
1 |
use IO::Socket::INET; |
19 |
dpavlin |
17 |
use File::Slurp; |
20 |
dpavlin |
1 |
use Data::Dump qw/dump/; |
21 |
|
|
|
22 |
dpavlin |
44 |
use lib '..'; |
23 |
dpavlin |
27 |
use Net::DHCP::Packet; |
24 |
|
|
use Net::DHCP::Constants 0.67; |
25 |
dpavlin |
1 |
|
26 |
dpavlin |
207 |
use CouchDB; |
27 |
dpavlin |
208 |
use format; |
28 |
dpavlin |
207 |
|
29 |
dpavlin |
44 |
use server; |
30 |
dpavlin |
67 |
my $debug = server::debug; |
31 |
dpavlin |
1 |
|
32 |
dpavlin |
44 |
if ( ! $server::ip ) { |
33 |
|
|
my $server_ip = `/sbin/ifconfig`; |
34 |
dpavlin |
22 |
$server_ip =~ s/^.+?addr:([\d\.]+).*$/$1/gs; |
35 |
dpavlin |
44 |
$server::ip = $server_ip; |
36 |
dpavlin |
22 |
} |
37 |
|
|
|
38 |
dpavlin |
110 |
warn "server ip $server::ip range: $server::ip_from - $server::ip_to\n"; |
39 |
dpavlin |
1 |
|
40 |
dpavlin |
168 |
use client; |
41 |
dpavlin |
17 |
|
42 |
dpavlin |
1 |
sub client_ip { |
43 |
|
|
my ( $mac ) = @_; |
44 |
|
|
|
45 |
dpavlin |
156 |
my $conf = $server::conf; |
46 |
dpavlin |
17 |
mkdir $conf unless -e $conf; |
47 |
dpavlin |
1 |
|
48 |
dpavlin |
177 |
my $ip; |
49 |
|
|
|
50 |
dpavlin |
194 |
if ( $ip = client::ip_from_mac( $mac ) ) { |
51 |
dpavlin |
94 |
print "RENEW $mac $ip\n"; |
52 |
dpavlin |
17 |
return $ip; |
53 |
dpavlin |
177 |
} else { |
54 |
dpavlin |
200 |
$ip = client::next_ip( $mac ); |
55 |
dpavlin |
177 |
print "NEW $mac $ip\n"; |
56 |
dpavlin |
17 |
} |
57 |
dpavlin |
1 |
|
58 |
|
|
return $ip; |
59 |
|
|
} |
60 |
|
|
|
61 |
dpavlin |
110 |
use log; |
62 |
|
|
use config; |
63 |
dpavlin |
129 |
use pxelinux; |
64 |
dpavlin |
160 |
use client; |
65 |
dpavlin |
110 |
|
66 |
|
|
our $file; |
67 |
dpavlin |
44 |
our $transaction = 0; # FIXME predictible transaction numbers |
68 |
dpavlin |
27 |
|
69 |
dpavlin |
44 |
sub process_packet { |
70 |
|
|
my $sock = shift; |
71 |
dpavlin |
1 |
|
72 |
dpavlin |
128 |
server->refresh; |
73 |
|
|
|
74 |
dpavlin |
1 |
my $buf; |
75 |
|
|
$sock->recv($buf, 1024); |
76 |
dpavlin |
44 |
my $size = 'empty'; |
77 |
|
|
$size = length($buf) . ' bytes' if defined $buf; |
78 |
dpavlin |
1 |
|
79 |
dpavlin |
94 |
print "packet from ",$sock->peerhost,":",$sock->peerport," $size\n" if $debug; |
80 |
dpavlin |
44 |
return unless $buf; |
81 |
dpavlin |
1 |
|
82 |
dpavlin |
44 |
my $dhcp = Net::DHCP::Packet->new($buf); |
83 |
|
|
$dhcp->comment( $transaction++ ); |
84 |
dpavlin |
1 |
|
85 |
dpavlin |
67 |
warn "recv: ", $dhcp->toString if $debug; |
86 |
dpavlin |
1 |
|
87 |
dpavlin |
44 |
my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2); |
88 |
|
|
my $ip = client_ip($mac); |
89 |
dpavlin |
1 |
|
90 |
dpavlin |
201 |
my $hostname = $dhcp->getOptionValue(DHO_HOST_NAME); |
91 |
|
|
print "$ip ", client::conf( $ip => 'hostname', default => $hostname ), " >> /etc/hosts\n"; |
92 |
|
|
|
93 |
dpavlin |
208 |
my $audit = { mac => format::mac($mac), ip => $ip, hostname => $hostname }; |
94 |
dpavlin |
207 |
|
95 |
dpavlin |
44 |
=for later |
96 |
dpavlin |
6 |
|
97 |
dpavlin |
44 |
my $user_class = $dhcp->getOptionValue(DHO_USER_CLASS()); |
98 |
dpavlin |
1 |
|
99 |
dpavlin |
44 |
if ( $user_class eq 'gPXE' ) { |
100 |
|
|
$file = $gpxe_file; |
101 |
|
|
} elsif ( ! $file ) { |
102 |
|
|
$file = 'undionly.kpxe'; |
103 |
|
|
} |
104 |
dpavlin |
22 |
|
105 |
dpavlin |
44 |
=cut |
106 |
|
|
|
107 |
dpavlin |
110 |
config::for_ip( $ip ); |
108 |
|
|
|
109 |
dpavlin |
44 |
my $packet = { |
110 |
|
|
Op => BOOTREPLY(), |
111 |
|
|
Hops => $dhcp->hops(), |
112 |
|
|
Xid => $dhcp->xid(), |
113 |
|
|
Flags => $dhcp->flags(), |
114 |
|
|
Ciaddr => $dhcp->ciaddr(), |
115 |
|
|
Yiaddr => $ip, |
116 |
|
|
Siaddr => $server::ip, |
117 |
|
|
Giaddr => $dhcp->giaddr(), |
118 |
|
|
Chaddr => $dhcp->chaddr(), |
119 |
dpavlin |
110 |
File => $file, |
120 |
dpavlin |
160 |
DHO_DHCP_SERVER_IDENTIFIER() => $server::ip, # busybox/udhcpc needs it but doesn't request |
121 |
dpavlin |
44 |
}; |
122 |
|
|
|
123 |
dpavlin |
160 |
my $options = { |
124 |
|
|
DHO_SUBNET_MASK() => $server::netmask, |
125 |
|
|
DHO_ROUTERS() => $server::ip, |
126 |
|
|
DHO_DOMAIN_NAME() => $server::domain_name, |
127 |
|
|
DHO_NAME_SERVERS() => $server::ip, |
128 |
|
|
DHO_DOMAIN_NAME_SERVERS() => $server::ip, |
129 |
|
|
DHO_HOST_NAME() => client::conf( $ip, 'hostname' ), |
130 |
|
|
DHO_BROADCAST_ADDRESS() => $server::bcast, |
131 |
|
|
# DHO_NTP_SERVERS() => '', |
132 |
|
|
}; |
133 |
|
|
|
134 |
|
|
my @requested = split(/\s/, $dhcp->getOptionValue(DHO_DHCP_PARAMETER_REQUEST_LIST)); |
135 |
dpavlin |
167 |
warn "options ",dump( $options ), ' requested: ',dump( @requested ) if $debug; |
136 |
|
|
|
137 |
|
|
my @missing; |
138 |
dpavlin |
160 |
foreach ( @requested ) { |
139 |
dpavlin |
167 |
if ( defined $options->{$_} ) { |
140 |
|
|
$packet->{$_} = $options->{$_}; |
141 |
|
|
} else { |
142 |
|
|
push @missing, $_; |
143 |
|
|
} |
144 |
dpavlin |
160 |
} |
145 |
|
|
|
146 |
dpavlin |
168 |
warn "W: options requested but missing: ",dump( @missing ),$/; |
147 |
dpavlin |
207 |
$audit->{requested} = [ @requested ]; |
148 |
|
|
$audit->{missing} = [ @missing ]; |
149 |
dpavlin |
167 |
|
150 |
dpavlin |
129 |
foreach my $opt ( 'magic', 'config_file', 'path_prefix', 'reboot_time' ) { |
151 |
|
|
my $DH0 = eval 'DHO_PXELINUX_' . uc $opt; |
152 |
|
|
warn "DH0: $@" if $@; |
153 |
|
|
my $v = eval "\$pxelinux::$opt"; |
154 |
|
|
warn "v: $@" if $@; |
155 |
|
|
next unless defined $v; |
156 |
dpavlin |
167 |
warn "pxelinux dhcp option $opt = $DH0 = $v\n" if $debug; |
157 |
dpavlin |
129 |
$packet->{ $DH0 } = $v; |
158 |
|
|
} |
159 |
|
|
|
160 |
dpavlin |
44 |
my $messagetype = $dhcp->getOptionValue(DHO_DHCP_MESSAGE_TYPE()); |
161 |
|
|
|
162 |
|
|
if ($messagetype eq DHCPDISCOVER()) { |
163 |
dpavlin |
207 |
$audit->{type} = 'discover'; |
164 |
dpavlin |
44 |
$packet->{Comment} = $dhcp->comment(); |
165 |
|
|
$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPOFFER(); |
166 |
|
|
} elsif ($messagetype eq DHCPREQUEST()) { |
167 |
|
|
my $requested_ip = $dhcp->getOptionValue(DHO_DHCP_REQUESTED_ADDRESS()); |
168 |
dpavlin |
207 |
$audit->{type} = 'request'; |
169 |
dpavlin |
44 |
if ( $ip eq $requested_ip ) { |
170 |
|
|
$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPACK(); |
171 |
|
|
$packet->{DHO_DHCP_LEASE_TIME()} = 5 * 60; # 5 min |
172 |
|
|
# $packet->{DHO_ROOT_PATH()} = '/exports/foobar'; |
173 |
dpavlin |
27 |
} else { |
174 |
dpavlin |
44 |
$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPNAK(); |
175 |
|
|
$packet->{DHO_DHCP_MESSAGE()} = "Bad request, expected $ip"; |
176 |
dpavlin |
27 |
} |
177 |
dpavlin |
44 |
} elsif ($messagetype eq DHCPINFORM()) { |
178 |
dpavlin |
207 |
$audit->{type} = 'inform'; |
179 |
dpavlin |
44 |
} else { |
180 |
dpavlin |
207 |
$audit->{type} = sprintf('ignored %x', $messagetype); |
181 |
dpavlin |
44 |
} |
182 |
dpavlin |
27 |
|
183 |
dpavlin |
110 |
warn ">> $mac == $ip server: $server::ip", $file ? " file: $file\n" : "\n" if $debug; |
184 |
dpavlin |
207 |
$audit->{response} = $packet; |
185 |
dpavlin |
27 |
|
186 |
dpavlin |
44 |
$packet = new Net::DHCP::Packet( %$packet ); |
187 |
dpavlin |
67 |
warn "send ",$packet->toString() if $debug; |
188 |
dpavlin |
27 |
|
189 |
dpavlin |
208 |
CouchDB::audit( $audit->{type}, $audit ); |
190 |
dpavlin |
207 |
|
191 |
dpavlin |
44 |
my $reply = IO::Socket::INET->new( |
192 |
|
|
LocalAddr => $server::ip, |
193 |
|
|
LocalPort => 67, |
194 |
|
|
Proto => "udp", |
195 |
|
|
Broadcast => 1, |
196 |
|
|
PeerAddr => '255.255.255.255', |
197 |
|
|
PeerPort => 68, |
198 |
|
|
Reuse => 1, |
199 |
|
|
) or die "socket: $@"; |
200 |
dpavlin |
1 |
|
201 |
dpavlin |
44 |
my $buff = $packet->serialize(); |
202 |
|
|
$reply->send( $buff, 0 ) or die "Error sending: $!\n"; |
203 |
dpavlin |
1 |
|
204 |
dpavlin |
44 |
# system("arp -s $ip $mac"), |
205 |
dpavlin |
1 |
|
206 |
dpavlin |
44 |
} |
207 |
dpavlin |
1 |
|
208 |
dpavlin |
44 |
sub start { |
209 |
|
|
|
210 |
|
|
my $sock = IO::Socket::INET->new( |
211 |
|
|
LocalPort => 67, |
212 |
|
|
# LocalAddr => 'localhost', |
213 |
|
|
# LocalAddr => '10.0.0.100', |
214 |
|
|
LocalAddr => '0.0.0.0', |
215 |
|
|
Proto => 'udp', |
216 |
|
|
ReuseAddr => 1, |
217 |
|
|
# PeerPort => getservbyname('bootpc', 'udp'), |
218 |
|
|
Broadcast => 1, |
219 |
|
|
Type => SOCK_DGRAM, |
220 |
|
|
) or die "Failed to bind to socket: $@"; |
221 |
|
|
|
222 |
|
|
print "DHCP listen on ",$sock->sockhost,":",$sock->sockport,"\n"; |
223 |
|
|
|
224 |
dpavlin |
207 |
CouchDB::audit( 'start', { 'listen' => { addr => $sock->sockhost, port => $sock->sockport } } ); |
225 |
|
|
|
226 |
dpavlin |
44 |
while (1) { |
227 |
|
|
process_packet $sock; |
228 |
dpavlin |
1 |
} |
229 |
dpavlin |
44 |
} |
230 |
dpavlin |
1 |
|
231 |
dpavlin |
45 |
warn "loaded"; |
232 |
|
|
|
233 |
dpavlin |
44 |
1; |